I think if you look at the price, it would be better and safer to use of the low-cost carriers.
probably cheaper too...
And quicker ...
Train takes 15 hours 50 minutes (treinreiziger.nl/internationaal/nachttreinen/dienstregelin g_nachttreinen/dienstregeling_nachttrein_amsterdam_-_warschau_-_moskou ). If I go by car, it takes me 10 hours 45 minutes.
The cheap carrier I use (Wizzair) takes you in 1 hours 55 minutes from Warsaw to Eindhoven (between €33 and €45 if you book about 6 weeks in advance). Then 20 minutes in the bus to Eindhoven Central Station (€3) and then 1 hour 20 minutes in the train to Amsterdam Central Station (direct connection - €17,20). So, incl. being present at the airport one hour in advance, it's a total traveling time of 4 hours and 15 minutes.
Total saving in time of 11 hours 25 minutes for a single trip. Total cost between €53,20 and €65,20 for a single fare. I don't know exactly how much a train ticket between Warsaw and Amsterdam costs, but I would think at least 4 times that amount.
